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干湿循环对崩岗土体稳定性的影响 被引量:14

The Influence of Wet-dry Cycles on Collapsing Gully Soil Stability
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摘要 通过对湖北通城花岗岩崩岗区发育典型的各层次土体(淋溶层、淀积层、过渡层、母质层)进行干湿循环试验,分析干湿交替次数对各层次土体裂隙发育、崩解性、抗剪强度的影响。结果表明,在干湿循环影响下,土体产生并逐渐发育裂隙,在第2次循环后,土体产生主要裂隙,裂隙比显著增加,此后循环发育出细小裂隙。4次循环后4个层次土体的裂隙比表现为淀积层>淋溶层>过渡层>母质层。随着干湿循环次数的增加,裂隙发育,各层次土体崩解性不断增强,淋溶层和淀积层崩解缓慢,而过渡层和母质层能够在极短时间内完全崩解;随着干湿循环次数的增加,土体的抗剪强度不断衰减,淋溶层和淀积层衰减幅度减小,过渡层和母质层衰减幅度增大。 This experiment aims at researching the change regulation of soil stability under the condition of wet-dry cycles of all layers of soil in collapsing gully erosion area where granite develops.By conducting the experiment of wet-dry cycles for typical development of all layers of the soil(eluvial horizon,illuvial horizon,cambic horizon and parent material horizon)of granite slope in collapsing gully erosion area in Tongcheng,Hubei province,we analyzed the influence of the times of wet-dry alternations on the development of soil cracks,the disintegration characteristics of soil and the shear strength of soil of all soil layers.The results showed that:Under the influence of wet-dry cycles,the soil developed cracks gradually;after the second cycle,main cracks arised,and the crack ratio increased significantly;after that,cycles developed small cracks.After 4times of wet-dry cycles,the size of the crack ratio of the 4layers of soil listed as illuvial horizon〉eluvial horizon〉cambic horizon〉parent material horizon.With the increasing times of wet-dry cycles,soil cracks developed,soil disintegration characteristics of all layers of soil increased constantly,and the disintegration of eluvial horizon and illuvial horizon was slow,while cambic horizon and parent material horizon could completely collapse in a very short time;With the increasing times of wet-dry cycles,the shear strength of soil attenuated constantly,and the amplitude attenuation of eluvial horizon and illuvial horizon decreased,while the amplitude attenuation of cambic horizon and parent material horizon increased.
出处 《水土保持学报》 CSCD 北大核心 2016年第6期253-258,共6页 Journal of Soil and Water Conservation
基金 国家自然科学基金项目"花岗岩红壤优先流及其与崩岗侵蚀发育的关系"(41571258) 华中农业大学国家级大学生创新创业训练计划项目"花岗岩崩岗不同层次土壤可蚀性与抗冲性对龛形成的影响"(201510504021)
关键词 崩岗 干湿循环 土壤裂隙 崩解性 抗剪强度 collapsing gully wet-dry cycles soil cracks disintegration characteristics shear strength
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